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Add non-SDK Python code example for Bulk Subscribe #4407

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Nov 19, 2024
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Expand Up @@ -336,14 +336,13 @@ Status | Description
`RETRY` | Message to be retried by Dapr
`DROP` | Warning is logged and message is dropped

Please refer [Expected HTTP Response for Bulk Subscribe]({{< ref pubsub_api.md >}}) for further insights on response.
Refer to [Expected HTTP Response for Bulk Subscribe]({{< ref pubsub_api.md >}}) for further insights on response.

### Example

Please refer following code samples for how to use Bulk Subscribe:

{{< tabs "Java" "JavaScript" ".NET" >}}
The following code examples demonstrate how to use Bulk Subscribe.

{{< tabs "Java" "JavaScript" ".NET" "Python" >}}
{{% codetab %}}

```java
Expand Down Expand Up @@ -471,7 +470,50 @@ public class BulkMessageController : ControllerBase

{{% /codetab %}}

{{% codetab %}}
Currently, you can only bulk subscribe in Python using an HTTP client.

```python
import json
from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/dapr/subscribe', methods=['GET'])
def subscribe():
# Define the bulk subscribe configuration
subscriptions = [{
"pubsubname": "pubsub",
"topic": "TOPIC_A",
"route": "/checkout",
"bulkSubscribe": {
"enabled": True,
"maxMessagesCount": 3,
"maxAwaitDurationMs": 40
}
}]
print('Dapr pub/sub is subscribed to: ' + json.dumps(subscriptions))
return jsonify(subscriptions)


# Define the endpoint to handle incoming messages
@app.route('/checkout', methods=['POST'])
def checkout():
messages = request.json
print(messages)
for message in messages:
print(f"Received message: {message}")
return json.dumps({'success': True}), 200, {'ContentType': 'application/json'}

if __name__ == '__main__':
app.run(port=5000)

```

{{% /codetab %}}

{{< /tabs >}}

## How components handle publishing and subscribing to bulk messages

For event publish/subscribe, two kinds of network transfers are involved.
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